Swivel chair



Dec. 5, 1950 A. ABRAMs N ETAL 2,532,873

. SWIVEL. CHAIR Filed Aug 5, 1946 3 Sheets-Sheet l 11950 A. ABRAMSON EI'AL ,532,

SWIVEL 0mm v 3 Sheets-Sheet 2 Filed Aug. 5, 1946 $2) 145017 73022 AQ 77mm 1950 A. ABRAMSON ETI'AL 2,532,

SWIVEL CHAIR Filed Aug. 5, 1946 3' Sh'eets-Shee't 5 Patented Dec. 5, 1950 angers oFFi cs SWIVEL CHAIR Albert Abramson and Harry Tillman Futrell, Houston, Tex.

Application August 5, 1946, Serial No. 688,446

1 Claim. 1

This invention relates to'co llapsible chairs.

An object of this invention is to provide an improved collapsible chair of tubular construction.

Another object of this invention is to provide, in a collapsible chair, a swivel seat which is rotatably carried :by the chair frame.

A further object of this invention is to provide in a collapsible chair, a seat and an improved means for rotatably supporting and mounting the seat.

A further object of this invention is to provide, in a device of this kind, a swivel mounting for the seat wherein the pivot for the seat 'will'not be subjected to any undue bending strains.

With the above and other objects in view, our invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claim.

In the drawings, wherein similar reference characters designate similar parts throughout the respective views:

Figure 1 is a detail side elevation of a chair constructed according to an embodiment of this invention, showing the chair in collapsed position,

Figure 2 is a detail side elevation of the chair in operative position,

Figure 3 is a fragmentary side elevation, partly in section, of one of the pivotal elements between the legs,

Figure 3a is 'a sectional view taken on the line 3a3a of Figure 3,

Figure 4 is a plan view, partly broken away and in section, of the chair in operative position,

Figure 5 is a fragmentary sectional view taken on the line 5-5 of Figure 4,

Figure 6 is an end elevation of another one the pivotal members for the legs,

Figure 6a. is a sectional view taken on the line 6a6a of Figure 6,

Figure '7 is a fragmentary sectional view taken on the line 1-1 of Figure 4,

Figure 8 is a plan view, partly broken away, of the back and forward leg structure,

Figure 9 is a fragmentary sectional view taken on the line 9-9 of Figure 2,

Figure 10 is a plan view of the rear leg structure,

Figure 11 is a sectional view taken on the line Hll of Figure 2.

Referring to the drawings, the numeral l5 designates generall a back and front leg structure which is formed of longitudinally bent partube bent in the configuration shown, and having the endsthereof welded together. At the upper ends of side members it, these members are bent rearwardly as shown in Figures 1 and- 2, and a back plate I9 is engaged over the upper portion of the side members 96 and the top member l8.

bent about the top member l8. If desired, the

back member l9 may be welded or otherwise 7 firmly secured to the upper portion'of the back frame structure. I

A rear leg structure is pivotally secured to the front leg structure formed by the lower portions of the side members It, and the rear leg structure is formed of U-shape, having parallel side members 20, a lower connecting member 2! integral with side members 2!), and an upper connecting bar 22 connects the upper ends of the side members 20 together. The two legs, that is, the front and rear legs of the chair, are pivotally connected together b means of a bracket 23 which is formed of a pair of plates 24, 25, welded or otherwise firmly secured together in face abutting relation.

The plate 25 is formed with an angularly bent portion 26 which engages a side member 2!! and may be welded or otherwise firmly secured thereto. In side elevation, the plates 23;, as, as shown in Figure 3, are of substantially triangular configuration. A bearing member 2i is fixed to the rear side of each side member to at a point above the lower end thereof and the bearing member 21 is pivotally connected to the bracket 23 by means of a pivot 23.

A seat supporting plate 29 is pivotally secured between a pair of bearing members so which are fixed to the forward sides of the side members It above the bearing members 21, and the plate 29 is formed with downturned side flanges 3 and a downwardly and forwardly inclined front flange 3|. The plate 29 is pivotally connected to the rear leg structure by means of a pair of links 32 which are pivotally connected as at 33 to the side members 20, and as at 34 to the flanges 38. The forward flange 3|, as shown in Figure 2, is adapted to engage over the upper ends of the side members 20 when the chair is in its extended 7 or operative position.

The plate 29, adjacent the forward end thereof, is formed with an upwardly offset disc 36 on which a spider or anti-friction bearing cage gen- The back member I9 is alse partly erally designated as 31 is adapted to loosely engage. A seat, generally designated as 38 is disposed over the bearing cage 8'! and is pivotally connected to the disc or lower race 36 by means of a headed bolt 39, having the head 40 thereof seated in a downwardly offset detent 41 formed in the seat 38. The bolt 39 extends through the center of the cage 3! and has the nut 42 thereof engaging beneath the plate or bearing race 36.

The cage 31 is formed with upwardly convergent outer and inner flanges 43. 44, which act as ball retainers, within which balls 45 loosely engage. The balls 45 extend through openings formed in the lower side d6 of the cage and enga e the upper side of the plate or race 36.

By providing the anti-friction bearing comprising the cage 31. the balls 45 between the plate or lower race 35, and the seat 38, which constitutes in the center thereof the upper race, the seat 38 is swivelably secured to the supporting mem er 29. The rear edge of the seat 38 is formed on an are as indicated at 4'! so hat the seat will readily clear the side members l6 of the ack structure when the chair is in its extended or operative position. This chair can be made entirely out of metal and will provide a strong chair which will also be of relatively light weight.

We do not mean to confine our elves to the exact details of construction herein disclosed but claim all variations falling within the purview of the appended claim.

Having thus described our invention, what we desire to claim is:

A collapsible chair comprising a combined back and front leg structure, a rear leg structure, means pivotally securing said structures together, a seat supporting plate pivotally secured at the rear thereof to said front leg structure, links pivotally connecting the forward portion of said plate to the upper portion of said rear leg structure, a seat having a central recess therein, said plate including an upwardly offset antifriction ball race, a headed pivot bolt extending through said seat and said race the head of said bolt seating in said recess flush with said seat, an antifriction ball cage between said race and said seat, and balls carried by said cage disposed between said race and said seat, said seat constituting an upper ball race engaging the balls above said ball cage.

ALBERT ABRAMSON.

HARRY TILLMAN FUTRELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Num er Name Date 477,113 Gruneberg June 14, 1892 1,617,805 Hansen Feb. 15, 1927 1,740,806 Clarin Dec. 24, 1929 1,883,322 Abbott Oct. 18, 1932 FOREIGN PATENTS Number Country Date 418,234 Great Britain Oct. 22, 1934 

